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The best three aspects of the front-light:
1. You can turn it off (or as near off as makes no difference on PW3).
2. You can turn it on.
3. Unlike Font size (on Kobo or Kiindle or Sony), the adjustable levels on Kindle and Kobo seem fine, though you only really need the lowest 20% (1/5th) unless you are using it as a torch to find something that rolled under the bed.
Flexibility is good. That's what I hate about win10 vs Win3.1, Win95, NT4.0, WinXP. The Win7/Vista started the MS rot.
It makes most sense to compare front lights at a standard level, probably whatever number of Lux is half perceptual brightness of a room lit only by a 4W LED lamp in a shade on a table lamp at the other side of the room, i.e. too dark to actually read paper but not too dark to move around. Comparison a minimum in the dark makes little sense other than say a reasonable reading brightness (some fixed level of Lux) in the dark.
I only read in the dark during a power cut.
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